Internet Control Message Protocol, a network protocol used for diagnostic and error reporting in computer networks.
Acronym created in 1981 as part of the Internet Protocol Suite development. Each letter represents a technical term: Internet (global network), Control (management), Message (communication), Protocol (standardized procedure).
ICMP is the internet's way of talking to itself about problems - when a webpage won't load, ICMP messages are often flying behind the scenes explaining what went wrong. The famous 'ping' command uses ICMP, making it one of the most commonly used but least understood protocols.
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